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the last word

Photography meets digital computer technology. Photography wins -- most of the time.

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Qimage color management

June 24, 2011 JimK 2 Comments

I blew it in the previous post when I said Qimage doesn’t do color management. I’m not sure what I was thinking; I had forgotten that I had used the color management features in the previous generation of Qimage, and I couldn’t find them in the v2011.136 version that I am currently using. The reason… [Read More]

Technical, The Last Word

Resampling for printing — Workflow

June 23, 2011 JimK 2 Comments

The ideal resampling workflow for me would be as follows: I select the images I want to print I click the tab for the “the Print” module in Lightroom I pick the print size, the printer, and the output resolution. Lightroom analyzes the image, and presents me with a menu of resampling algorithms, some of… [Read More]

Technical, The Bleeding Edge

Resampling for printing, revisited, 5

June 22, 2011 JimK Leave a Comment

What’s it all mean? Unfortunately, for those of us who just want a simple answer, the results of this testing indicates that one size doesn’t fit all. The Photoshop bicubic sharper algorithm seems to be better than anything for the particular down res-ing operation that I tested. Testing with a variety of resolution ratios might… [Read More]

Technical, The Last Word

Resampling for printing, revisited 4

June 22, 2011 JimK Leave a Comment

What with stitching and 20+ megapixel backs, sometimes you have to res an image down to print it. I tested all four algorithms on a 480 ppi image resampled down to 360 ppi. Instead of using bicubic smoother in Photoshop, I used bicubic sharper, which Adobe recommends for down-resing. The results: Photoshop Bicubic Sharper (above)… [Read More]

Technical, The Bleeding Edge

Resampling for printing, revisited 3

June 22, 2011 JimK Leave a Comment

The next set of images is res’ed up from 330 ppi to 360 ppi. With some resampling techniques, notably and egregiously nearest neighbor, resampling with resolutions that are close together yields obvious objectionable artifacts. As before, the results are followed by an analysis. Photoshop Bicubic Smoother (above) Perfect Resize (above) Qimage Hybrid (above) Qimage Fusion… [Read More]

Technical, The Last Word

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Articles

  • About
    • Patents and papers about color
    • Who am I?
  • How to…
    • Backing up photographic images
    • How to change email providers
    • How to shoot slanted edge images for me
  • Lens screening testing
    • Equipment and Software
    • Examples
      • Bad and OK 200-600 at 600
      • Excellent 180-400 zoom
      • Fair 14-30mm zoom
      • Good 100-200 mm MF zoom
      • Good 100-400 zoom
      • Good 100mm lens on P1 P45+
      • Good 120mm MF lens
      • Good 18mm FF lens
      • Good 24-105 mm FF lens
      • Good 24-70 FF zoom
      • Good 35 mm FF lens
      • Good 35-70 MF lens
      • Good 60 mm lens on IQ3-100
      • Good 63 mm MF lens
      • Good 65 mm FF lens
      • Good 85 mm FF lens
      • Good and bad 25mm FF lenses
      • Good zoom at 24 mm
      • Marginal 18mm lens
      • Marginal 35mm FF lens
      • Mildly problematic 55 mm FF lens
      • OK 16-35mm zoom
      • OK 60mm lens on P1 P45+
      • OK Sony 600mm f/4
      • Pretty good 16-35 FF zoom
      • Pretty good 90mm FF lens
      • Problematic 400 mm FF lens
      • Tilted 20 mm f/1.8 FF lens
      • Tilted 30 mm MF lens
      • Tilted 50 mm FF lens
      • Two 15mm FF lenses
    • Found a problem – now what?
    • Goals for this test
    • Minimum target distances
      • MFT
      • APS-C
      • Full frame
      • Small medium format
    • Printable Siemens Star targets
    • Target size on sensor
      • MFT
      • APS-C
      • Full frame
      • Small medium format
    • Test instructions — postproduction
    • Test instructions — reading the images
    • Test instructions – capture
    • Theory of the test
    • What’s wrong with conventional lens screening?
  • Previsualization heresy
  • Privacy Policy
  • Recommended photographic web sites
  • Using in-camera histograms for ETTR
    • Acknowledgments
    • Why ETTR?
    • Normal in-camera histograms
    • Image processing for in-camera histograms
    • Making the in-camera histogram closely represent the raw histogram
    • Shortcuts to UniWB
    • Preparing for monitor-based UniWB
    • A one-step UniWB procedure
    • The math behind the one-step method
    • Iteration using Newton’s Method

Category List

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